修正主视图长/宽样式，修复外部导入调用时实体缺失问题

src/common/MaterialSerializer.ts

@@ -1,4 +1,4 @@
-import { CADFactory, CADFiler, CADObject, Database, DuplicateRecordCloning, ObjectId, PhysicalMaterialRecord } from "webcad_ue4_api";
+import { CADFactory, CADFiler, CADObject, Database, DuplicateRecordCloning, Factory, LayerNode, ObjectId, PhysicalMaterialRecord } from "webcad_ue4_api";
 
 // TODO: Danger: 注意入侵性代码
 // 疑似是WebCAD中的漏洞，当传入new Database()时，